SAP Message UMG370 - Reset/Restart not possible. Worker jobs are running.

Diagnosis You tried to reset or to restart transaction SPUMG. This is currentlynot allowed because SPUMG worker jobs are still active (running,released or scheduled). System Response SPUMG will not be reset for now. Procedure Please go to transaction SM37 and search for background jobs in the namespace UMG* with the status "Running", "Released" or "Scheduled". If you want to reset SPUMG you have to cancel the jobs before. Otherwisewait until the jobs are finished.